fixed webpack build config

react/webpack.config.js

@@ -121,7 +121,7 @@ if (isProduction) {
       test: /\.scss$/,
       loader: ExtractTextPlugin.extract({
         fallback: 'style-loader',
-        use: 'css-loader!postcss-loader!sass-loader',
+        use: 'css-loader!postcss-loader!sass-loader!file-loader!url-loader',
       }),
     }
   );
@@ -160,7 +160,7 @@ module.exports = {
   },
   output: {
     path: buildPath,
-    publicPath: '/',
+    publicPath: '',
     filename: 'app-[hash].js',
   },
   module: {